I am developing a game,in that i want to add the points continuously,for this i used plist but whenever the screen is disappear and starts then plist starts again.what to do
You can make AppDelegate variables and store it in them. There scope remains in the complete application until the application closes.
In AppDelegate.h for example
NSString *string;
@property(nonatomic, strong) NSString *string;
In AppDelegate.m
@synthesize string;
in applicationDidFinishLaunchingWithOptions
string = @"";
And then is your classes
add #import "AppDelegate.h"
then in your code
((AppDelegate *)[UIApplication SharedApplication].Delegate).string = @"1";